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Commit | Line | Data |
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9d09e663 N |
1 | /* |
2 | * Copyright (C) 2010-2011 Neil Brown | |
702108d1 | 3 | * Copyright (C) 2010-2016 Red Hat, Inc. All rights reserved. |
9d09e663 N |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include <linux/slab.h> | |
056075c7 | 9 | #include <linux/module.h> |
9d09e663 N |
10 | |
11 | #include "md.h" | |
32737279 | 12 | #include "raid1.h" |
9d09e663 | 13 | #include "raid5.h" |
63f33b8d | 14 | #include "raid10.h" |
9d09e663 N |
15 | #include "bitmap.h" |
16 | ||
3e8dbb7f AK |
17 | #include <linux/device-mapper.h> |
18 | ||
9d09e663 | 19 | #define DM_MSG_PREFIX "raid" |
92c83d79 | 20 | #define MAX_RAID_DEVICES 253 /* md-raid kernel limit */ |
9d09e663 | 21 | |
48cf06bc HM |
22 | static bool devices_handle_discard_safely = false; |
23 | ||
9d09e663 | 24 | /* |
b12d437b JB |
25 | * The following flags are used by dm-raid.c to set up the array state. |
26 | * They must be cleared before md_run is called. | |
9d09e663 | 27 | */ |
b12d437b | 28 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
29 | |
30 | struct raid_dev { | |
31 | /* | |
32 | * Two DM devices, one to hold metadata and one to hold the | |
33 | * actual data/parity. The reason for this is to not confuse | |
34 | * ti->len and give more flexibility in altering size and | |
35 | * characteristics. | |
36 | * | |
37 | * While it is possible for this device to be associated | |
38 | * with a different physical device than the data_dev, it | |
39 | * is intended for it to be the same. | |
40 | * |--------- Physical Device ---------| | |
41 | * |- meta_dev -|------ data_dev ------| | |
42 | */ | |
43 | struct dm_dev *meta_dev; | |
44 | struct dm_dev *data_dev; | |
3cb03002 | 45 | struct md_rdev rdev; |
9d09e663 N |
46 | }; |
47 | ||
48 | /* | |
c76d53f4 | 49 | * Flags for rs->ctr_flags field. |
702108d1 HM |
50 | * |
51 | * 1 = no flag value | |
52 | * 2 = flag with value | |
9d09e663 | 53 | */ |
702108d1 HM |
54 | #define CTR_FLAG_SYNC 0x1 /* 1 */ /* Not with raid0! */ |
55 | #define CTR_FLAG_NOSYNC 0x2 /* 1 */ /* Not with raid0! */ | |
56 | #define CTR_FLAG_REBUILD 0x4 /* 2 */ /* Not with raid0! */ | |
57 | #define CTR_FLAG_DAEMON_SLEEP 0x8 /* 2 */ /* Not with raid0! */ | |
58 | #define CTR_FLAG_MIN_RECOVERY_RATE 0x10 /* 2 */ /* Not with raid0! */ | |
59 | #define CTR_FLAG_MAX_RECOVERY_RATE 0x20 /* 2 */ /* Not with raid0! */ | |
60 | #define CTR_FLAG_MAX_WRITE_BEHIND 0x40 /* 2 */ /* Only with raid1! */ | |
61 | #define CTR_FLAG_WRITE_MOSTLY 0x80 /* 2 */ /* Only with raid1! */ | |
62 | #define CTR_FLAG_STRIPE_CACHE 0x100 /* 2 */ /* Only with raid4/5/6! */ | |
63 | #define CTR_FLAG_REGION_SIZE 0x200 /* 2 */ /* Not with raid0! */ | |
64 | #define CTR_FLAG_RAID10_COPIES 0x400 /* 2 */ /* Only with raid10 */ | |
65 | #define CTR_FLAG_RAID10_FORMAT 0x800 /* 2 */ /* Only with raid10 */ | |
63f33b8d | 66 | |
f090279e HM |
67 | /* |
68 | * Definitions of various constructor flags to | |
69 | * be used in checks of valid / invalid flags | |
70 | * per raid level. | |
71 | */ | |
72 | /* Define all any sync flags */ | |
73 | #define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC) | |
74 | ||
75 | /* Define flags for options without argument (e.g. 'nosync') */ | |
76 | #define CTR_FLAG_OPTIONS_NO_ARGS CTR_FLAGS_ANY_SYNC | |
77 | ||
78 | /* Define flags for options with one argument (e.g. 'delta_disks +2') */ | |
79 | #define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \ | |
80 | CTR_FLAG_WRITE_MOSTLY | \ | |
81 | CTR_FLAG_DAEMON_SLEEP | \ | |
82 | CTR_FLAG_MIN_RECOVERY_RATE | \ | |
83 | CTR_FLAG_MAX_RECOVERY_RATE | \ | |
84 | CTR_FLAG_MAX_WRITE_BEHIND | \ | |
85 | CTR_FLAG_STRIPE_CACHE | \ | |
86 | CTR_FLAG_REGION_SIZE | \ | |
87 | CTR_FLAG_RAID10_COPIES | \ | |
88 | CTR_FLAG_RAID10_FORMAT) | |
89 | ||
90 | /* All ctr optional arguments */ | |
91 | #define ALL_CTR_FLAGS (CTR_FLAG_OPTIONS_NO_ARGS | \ | |
92 | CTR_FLAG_OPTIONS_ONE_ARG) | |
93 | ||
94 | /* Invalid options definitions per raid level... */ | |
95 | ||
96 | /* "raid0" does not accept any options */ | |
97 | #define RAID0_INVALID_FLAGS ALL_CTR_FLAGS | |
98 | ||
99 | /* "raid1" does not accept stripe cache or any raid10 options */ | |
100 | #define RAID1_INVALID_FLAGS (CTR_FLAG_STRIPE_CACHE | \ | |
101 | CTR_FLAG_RAID10_COPIES | \ | |
102 | CTR_FLAG_RAID10_FORMAT) | |
103 | ||
104 | /* "raid10" does not accept any raid1 or stripe cache options */ | |
105 | #define RAID10_INVALID_FLAGS (CTR_FLAG_WRITE_MOSTLY | \ | |
106 | CTR_FLAG_MAX_WRITE_BEHIND | \ | |
107 | CTR_FLAG_STRIPE_CACHE) | |
108 | /* | |
109 | * "raid4/5/6" do not accept any raid1 or raid10 specific options | |
110 | * | |
111 | * "raid6" does not accept "nosync", because it is not guaranteed | |
112 | * that both parity and q-syndrome are being written properly with | |
113 | * any writes | |
114 | */ | |
115 | #define RAID45_INVALID_FLAGS (CTR_FLAG_WRITE_MOSTLY | \ | |
116 | CTR_FLAG_MAX_WRITE_BEHIND | \ | |
117 | CTR_FLAG_RAID10_FORMAT | \ | |
118 | CTR_FLAG_RAID10_COPIES) | |
119 | #define RAID6_INVALID_FLAGS (CTR_FLAG_NOSYNC | RAID45_INVALID_FLAGS) | |
120 | /* ...invalid options definitions per raid level */ | |
121 | ||
9d09e663 N |
122 | struct raid_set { |
123 | struct dm_target *ti; | |
124 | ||
34f8ac6d | 125 | uint32_t bitmap_loaded; |
c76d53f4 | 126 | uint32_t ctr_flags; |
9d09e663 | 127 | |
fd01b88c | 128 | struct mddev md; |
9d09e663 N |
129 | struct raid_type *raid_type; |
130 | struct dm_target_callbacks callbacks; | |
131 | ||
132 | struct raid_dev dev[0]; | |
133 | }; | |
134 | ||
135 | /* Supported raid types and properties. */ | |
136 | static struct raid_type { | |
137 | const char *name; /* RAID algorithm. */ | |
138 | const char *descr; /* Descriptor text for logging. */ | |
139 | const unsigned parity_devs; /* # of parity devices. */ | |
140 | const unsigned minimal_devs; /* minimal # of devices in set. */ | |
141 | const unsigned level; /* RAID level. */ | |
142 | const unsigned algorithm; /* RAID algorithm. */ | |
143 | } raid_types[] = { | |
0cf45031 | 144 | {"raid0", "RAID0 (striping)", 0, 2, 0, 0 /* NONE */}, |
32737279 | 145 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
63f33b8d | 146 | {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */}, |
9d09e663 N |
147 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
148 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, | |
149 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, | |
150 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, | |
151 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, | |
152 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, | |
153 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, | |
154 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} | |
155 | }; | |
156 | ||
92c83d79 HM |
157 | /* True, if @v is in inclusive range [@min, @max] */ |
158 | static bool _in_range(long v, long min, long max) | |
159 | { | |
160 | return v >= min && v <= max; | |
161 | } | |
162 | ||
702108d1 HM |
163 | /* ctr flag bit manipulation... */ |
164 | /* Set single @flag in @flags */ | |
165 | static void _set_flag(uint32_t flag, uint32_t *flags) | |
166 | { | |
167 | WARN_ON_ONCE(hweight32(flag) != 1); | |
168 | *flags |= flag; | |
169 | } | |
170 | ||
171 | /* Test single @flag in @flags */ | |
172 | static bool _test_flag(uint32_t flag, uint32_t flags) | |
173 | { | |
174 | WARN_ON_ONCE(hweight32(flag) != 1); | |
175 | return (flag & flags) ? true : false; | |
176 | } | |
177 | ||
ad51d7f1 HM |
178 | /* Test multiple @flags in @all_flags */ |
179 | static bool _test_flags(uint32_t flags, uint32_t all_flags) | |
180 | { | |
181 | return (flags & all_flags) ? true : false; | |
182 | } | |
183 | ||
702108d1 HM |
184 | /* Return true if single @flag is set in @*flags, else set it and return false */ |
185 | static bool _test_and_set_flag(uint32_t flag, uint32_t *flags) | |
186 | { | |
187 | if (_test_flag(flag, *flags)) | |
188 | return true; | |
189 | ||
190 | _set_flag(flag, flags); | |
191 | return false; | |
192 | } | |
193 | /* ...ctr and runtime flag bit manipulation */ | |
194 | ||
195 | /* All table line arguments are defined here */ | |
196 | static struct arg_name_flag { | |
197 | const uint32_t flag; | |
198 | const char *name; | |
199 | } _arg_name_flags[] = { | |
200 | { CTR_FLAG_SYNC, "sync"}, | |
201 | { CTR_FLAG_NOSYNC, "nosync"}, | |
202 | { CTR_FLAG_REBUILD, "rebuild"}, | |
203 | { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"}, | |
204 | { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"}, | |
205 | { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"}, | |
206 | { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"}, | |
207 | { CTR_FLAG_WRITE_MOSTLY, "writemostly"}, | |
208 | { CTR_FLAG_STRIPE_CACHE, "stripe_cache"}, | |
209 | { CTR_FLAG_REGION_SIZE, "region_size"}, | |
210 | { CTR_FLAG_RAID10_COPIES, "raid10_copies"}, | |
211 | { CTR_FLAG_RAID10_FORMAT, "raid10_format"}, | |
212 | }; | |
213 | ||
214 | /* Return argument name string for given @flag */ | |
215 | static const char *_argname_by_flag(const uint32_t flag) | |
216 | { | |
217 | if (hweight32(flag) == 1) { | |
218 | struct arg_name_flag *anf = _arg_name_flags + ARRAY_SIZE(_arg_name_flags); | |
219 | ||
220 | while (anf-- > _arg_name_flags) | |
221 | if (_test_flag(flag, anf->flag)) | |
222 | return anf->name; | |
223 | ||
224 | } else | |
225 | DMERR("%s called with more than one flag!", __func__); | |
226 | ||
227 | return NULL; | |
228 | } | |
229 | ||
f090279e HM |
230 | /* |
231 | * bool helpers to test for various raid levels of a raid type | |
232 | */ | |
233 | ||
234 | /* Return true, if raid type in @rt is raid0 */ | |
235 | static bool rt_is_raid0(struct raid_type *rt) | |
236 | { | |
237 | return !rt->level; | |
238 | } | |
239 | ||
240 | /* Return true, if raid type in @rt is raid1 */ | |
241 | static bool rt_is_raid1(struct raid_type *rt) | |
242 | { | |
243 | return rt->level == 1; | |
244 | } | |
245 | ||
246 | /* Return true, if raid type in @rt is raid10 */ | |
247 | static bool rt_is_raid10(struct raid_type *rt) | |
248 | { | |
249 | return rt->level == 10; | |
250 | } | |
251 | ||
252 | /* Return true, if raid type in @rt is raid4/5 */ | |
253 | static bool rt_is_raid45(struct raid_type *rt) | |
254 | { | |
255 | return _in_range(rt->level, 4, 5); | |
256 | } | |
257 | ||
258 | /* Return true, if raid type in @rt is raid6 */ | |
259 | static bool rt_is_raid6(struct raid_type *rt) | |
260 | { | |
261 | return rt->level == 6; | |
262 | } | |
676fa5ad HM |
263 | |
264 | /* Return true, if raid type in @rt is raid4/5/6 */ | |
265 | static bool rt_is_raid456(struct raid_type *rt) | |
266 | { | |
267 | return _in_range(rt->level, 4, 6); | |
268 | } | |
f090279e HM |
269 | /* END: raid level bools */ |
270 | ||
702108d1 HM |
271 | /* |
272 | * Convenience functions to set ti->error to @errmsg and | |
273 | * return @r in order to shorten code in a lot of places | |
274 | */ | |
275 | static int ti_error_ret(struct dm_target *ti, const char *errmsg, int r) | |
276 | { | |
277 | ti->error = (char *) errmsg; | |
278 | return r; | |
279 | } | |
280 | ||
281 | static int ti_error_einval(struct dm_target *ti, const char *errmsg) | |
282 | { | |
283 | return ti_error_ret(ti, errmsg, -EINVAL); | |
284 | } | |
285 | /* END: convenience functions to set ti->error to @errmsg... */ | |
286 | ||
f090279e HM |
287 | /* Return invalid ctr flags for the raid level of @rs */ |
288 | static uint32_t _invalid_flags(struct raid_set *rs) | |
289 | { | |
290 | if (rt_is_raid0(rs->raid_type)) | |
291 | return RAID0_INVALID_FLAGS; | |
292 | else if (rt_is_raid1(rs->raid_type)) | |
293 | return RAID1_INVALID_FLAGS; | |
294 | else if (rt_is_raid10(rs->raid_type)) | |
295 | return RAID10_INVALID_FLAGS; | |
296 | else if (rt_is_raid45(rs->raid_type)) | |
297 | return RAID45_INVALID_FLAGS; | |
298 | else if (rt_is_raid6(rs->raid_type)) | |
299 | return RAID6_INVALID_FLAGS; | |
300 | ||
301 | return ~0; | |
302 | } | |
303 | ||
304 | /* | |
305 | * Check for any invalid flags set on @rs defined by bitset @invalid_flags | |
306 | * | |
307 | * Has to be called after parsing of the ctr flags! | |
308 | */ | |
309 | static int rs_check_for_invalid_flags(struct raid_set *rs) | |
310 | { | |
ad51d7f1 HM |
311 | if (_test_flags(rs->ctr_flags, _invalid_flags(rs))) |
312 | return ti_error_einval(rs->ti, "Invalid flag combined"); | |
f090279e HM |
313 | |
314 | return 0; | |
315 | } | |
316 | ||
fe5d2f4a JB |
317 | static char *raid10_md_layout_to_format(int layout) |
318 | { | |
319 | /* | |
320 | * Bit 16 and 17 stand for "offset" and "use_far_sets" | |
321 | * Refer to MD's raid10.c for details | |
322 | */ | |
323 | if ((layout & 0x10000) && (layout & 0x20000)) | |
324 | return "offset"; | |
325 | ||
326 | if ((layout & 0xFF) > 1) | |
327 | return "near"; | |
328 | ||
329 | return "far"; | |
330 | } | |
331 | ||
63f33b8d JB |
332 | static unsigned raid10_md_layout_to_copies(int layout) |
333 | { | |
fe5d2f4a JB |
334 | if ((layout & 0xFF) > 1) |
335 | return layout & 0xFF; | |
336 | return (layout >> 8) & 0xFF; | |
63f33b8d JB |
337 | } |
338 | ||
339 | static int raid10_format_to_md_layout(char *format, unsigned copies) | |
340 | { | |
fe5d2f4a JB |
341 | unsigned n = 1, f = 1; |
342 | ||
c76d53f4 | 343 | if (!strcasecmp("near", format)) |
fe5d2f4a JB |
344 | n = copies; |
345 | else | |
346 | f = copies; | |
347 | ||
c76d53f4 | 348 | if (!strcasecmp("offset", format)) |
fe5d2f4a JB |
349 | return 0x30000 | (f << 8) | n; |
350 | ||
c76d53f4 | 351 | if (!strcasecmp("far", format)) |
fe5d2f4a JB |
352 | return 0x20000 | (f << 8) | n; |
353 | ||
354 | return (f << 8) | n; | |
63f33b8d JB |
355 | } |
356 | ||
92c83d79 | 357 | static struct raid_type *get_raid_type(const char *name) |
9d09e663 N |
358 | { |
359 | int i; | |
360 | ||
361 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) | |
362 | if (!strcmp(raid_types[i].name, name)) | |
363 | return &raid_types[i]; | |
364 | ||
365 | return NULL; | |
366 | } | |
367 | ||
368 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) | |
369 | { | |
370 | unsigned i; | |
371 | struct raid_set *rs; | |
9d09e663 | 372 | |
702108d1 HM |
373 | if (raid_devs <= raid_type->parity_devs) |
374 | return ERR_PTR(ti_error_einval(ti, "Insufficient number of devices")); | |
9d09e663 | 375 | |
9d09e663 | 376 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
702108d1 HM |
377 | if (!rs) |
378 | return ERR_PTR(ti_error_ret(ti, "Cannot allocate raid context", -ENOMEM)); | |
9d09e663 N |
379 | |
380 | mddev_init(&rs->md); | |
381 | ||
382 | rs->ti = ti; | |
383 | rs->raid_type = raid_type; | |
384 | rs->md.raid_disks = raid_devs; | |
385 | rs->md.level = raid_type->level; | |
386 | rs->md.new_level = rs->md.level; | |
9d09e663 N |
387 | rs->md.layout = raid_type->algorithm; |
388 | rs->md.new_layout = rs->md.layout; | |
389 | rs->md.delta_disks = 0; | |
390 | rs->md.recovery_cp = 0; | |
391 | ||
392 | for (i = 0; i < raid_devs; i++) | |
393 | md_rdev_init(&rs->dev[i].rdev); | |
394 | ||
395 | /* | |
396 | * Remaining items to be initialized by further RAID params: | |
397 | * rs->md.persistent | |
398 | * rs->md.external | |
399 | * rs->md.chunk_sectors | |
400 | * rs->md.new_chunk_sectors | |
c039c332 | 401 | * rs->md.dev_sectors |
9d09e663 N |
402 | */ |
403 | ||
404 | return rs; | |
405 | } | |
406 | ||
407 | static void context_free(struct raid_set *rs) | |
408 | { | |
409 | int i; | |
410 | ||
b12d437b JB |
411 | for (i = 0; i < rs->md.raid_disks; i++) { |
412 | if (rs->dev[i].meta_dev) | |
413 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
545c8795 | 414 | md_rdev_clear(&rs->dev[i].rdev); |
9d09e663 N |
415 | if (rs->dev[i].data_dev) |
416 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 417 | } |
9d09e663 N |
418 | |
419 | kfree(rs); | |
420 | } | |
421 | ||
422 | /* | |
423 | * For every device we have two words | |
424 | * <meta_dev>: meta device name or '-' if missing | |
425 | * <data_dev>: data device name or '-' if missing | |
426 | * | |
b12d437b JB |
427 | * The following are permitted: |
428 | * - - | |
429 | * - <data_dev> | |
430 | * <meta_dev> <data_dev> | |
431 | * | |
432 | * The following is not allowed: | |
433 | * <meta_dev> - | |
434 | * | |
435 | * This code parses those words. If there is a failure, | |
436 | * the caller must use context_free to unwind the operations. | |
9d09e663 | 437 | */ |
702108d1 | 438 | static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as) |
9d09e663 N |
439 | { |
440 | int i; | |
441 | int rebuild = 0; | |
442 | int metadata_available = 0; | |
73c6f239 | 443 | int r = 0; |
92c83d79 | 444 | const char *arg; |
9d09e663 | 445 | |
92c83d79 HM |
446 | /* Put off the number of raid devices argument to get to dev pairs */ |
447 | arg = dm_shift_arg(as); | |
448 | if (!arg) | |
449 | return -EINVAL; | |
450 | ||
451 | for (i = 0; i < rs->md.raid_disks; i++) { | |
9d09e663 N |
452 | rs->dev[i].rdev.raid_disk = i; |
453 | ||
454 | rs->dev[i].meta_dev = NULL; | |
455 | rs->dev[i].data_dev = NULL; | |
456 | ||
457 | /* | |
458 | * There are no offsets, since there is a separate device | |
459 | * for data and metadata. | |
460 | */ | |
461 | rs->dev[i].rdev.data_offset = 0; | |
462 | rs->dev[i].rdev.mddev = &rs->md; | |
463 | ||
92c83d79 HM |
464 | arg = dm_shift_arg(as); |
465 | if (!arg) | |
466 | return -EINVAL; | |
467 | ||
468 | if (strcmp(arg, "-")) { | |
469 | r = dm_get_device(rs->ti, arg, | |
b12d437b JB |
470 | dm_table_get_mode(rs->ti->table), |
471 | &rs->dev[i].meta_dev); | |
73c6f239 | 472 | if (r) |
702108d1 | 473 | return ti_error_ret(rs->ti, "RAID metadata device lookup failure", r); |
b12d437b JB |
474 | |
475 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
476 | if (!rs->dev[i].rdev.sb_page) | |
702108d1 | 477 | return ti_error_ret(rs->ti, "Failed to allocate superblock page", -ENOMEM); |
9d09e663 N |
478 | } |
479 | ||
92c83d79 HM |
480 | arg = dm_shift_arg(as); |
481 | if (!arg) | |
482 | return -EINVAL; | |
483 | ||
484 | if (!strcmp(arg, "-")) { | |
9d09e663 | 485 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && |
702108d1 HM |
486 | (!rs->dev[i].rdev.recovery_offset)) |
487 | return ti_error_einval(rs->ti, "Drive designated for rebuild not specified"); | |
9d09e663 | 488 | |
b12d437b | 489 | if (rs->dev[i].meta_dev) |
702108d1 | 490 | return ti_error_einval(rs->ti, "No data device supplied with metadata device"); |
b12d437b | 491 | |
9d09e663 N |
492 | continue; |
493 | } | |
494 | ||
92c83d79 | 495 | r = dm_get_device(rs->ti, arg, |
9d09e663 N |
496 | dm_table_get_mode(rs->ti->table), |
497 | &rs->dev[i].data_dev); | |
702108d1 HM |
498 | if (r) |
499 | return ti_error_ret(rs->ti, "RAID device lookup failure", r); | |
9d09e663 | 500 | |
b12d437b JB |
501 | if (rs->dev[i].meta_dev) { |
502 | metadata_available = 1; | |
503 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
504 | } | |
9d09e663 N |
505 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
506 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); | |
507 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
508 | rebuild++; | |
509 | } | |
510 | ||
511 | if (metadata_available) { | |
512 | rs->md.external = 0; | |
513 | rs->md.persistent = 1; | |
514 | rs->md.major_version = 2; | |
515 | } else if (rebuild && !rs->md.recovery_cp) { | |
516 | /* | |
517 | * Without metadata, we will not be able to tell if the array | |
518 | * is in-sync or not - we must assume it is not. Therefore, | |
519 | * it is impossible to rebuild a drive. | |
520 | * | |
521 | * Even if there is metadata, the on-disk information may | |
522 | * indicate that the array is not in-sync and it will then | |
523 | * fail at that time. | |
524 | * | |
525 | * User could specify 'nosync' option if desperate. | |
526 | */ | |
527 | DMERR("Unable to rebuild drive while array is not in-sync"); | |
702108d1 | 528 | return ti_error_einval(rs->ti, "Unable to rebuild drive while array is not in-sync"); |
9d09e663 N |
529 | } |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
c1084561 JB |
534 | /* |
535 | * validate_region_size | |
536 | * @rs | |
537 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
538 | * | |
539 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
540 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
541 | * | |
542 | * Returns: 0 on success, -EINVAL on failure. | |
543 | */ | |
544 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
545 | { | |
546 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
547 | ||
548 | if (!region_size) { | |
549 | /* | |
550 | * Choose a reasonable default. All figures in sectors. | |
551 | */ | |
552 | if (min_region_size > (1 << 13)) { | |
3a0f9aae | 553 | /* If not a power of 2, make it the next power of 2 */ |
042745ee | 554 | region_size = roundup_pow_of_two(min_region_size); |
c1084561 JB |
555 | DMINFO("Choosing default region size of %lu sectors", |
556 | region_size); | |
c1084561 JB |
557 | } else { |
558 | DMINFO("Choosing default region size of 4MiB"); | |
559 | region_size = 1 << 13; /* sectors */ | |
560 | } | |
561 | } else { | |
562 | /* | |
563 | * Validate user-supplied value. | |
564 | */ | |
702108d1 HM |
565 | if (region_size > rs->ti->len) |
566 | return ti_error_einval(rs->ti, "Supplied region size is too large"); | |
c1084561 JB |
567 | |
568 | if (region_size < min_region_size) { | |
569 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
570 | region_size, min_region_size); | |
702108d1 | 571 | return ti_error_einval(rs->ti, "Supplied region size is too small"); |
c1084561 JB |
572 | } |
573 | ||
702108d1 HM |
574 | if (!is_power_of_2(region_size)) |
575 | return ti_error_einval(rs->ti, "Region size is not a power of 2"); | |
c1084561 | 576 | |
702108d1 HM |
577 | if (region_size < rs->md.chunk_sectors) |
578 | return ti_error_einval(rs->ti, "Region size is smaller than the chunk size"); | |
c1084561 JB |
579 | } |
580 | ||
581 | /* | |
582 | * Convert sectors to bytes. | |
583 | */ | |
584 | rs->md.bitmap_info.chunksize = (region_size << 9); | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
eb649123 | 589 | /* |
55ebbb59 | 590 | * validate_raid_redundancy |
eb649123 JB |
591 | * @rs |
592 | * | |
55ebbb59 JB |
593 | * Determine if there are enough devices in the array that haven't |
594 | * failed (or are being rebuilt) to form a usable array. | |
eb649123 JB |
595 | * |
596 | * Returns: 0 on success, -EINVAL on failure. | |
597 | */ | |
55ebbb59 | 598 | static int validate_raid_redundancy(struct raid_set *rs) |
eb649123 JB |
599 | { |
600 | unsigned i, rebuild_cnt = 0; | |
3f6bbd3f | 601 | unsigned rebuilds_per_group = 0, copies, d; |
fe5d2f4a | 602 | unsigned group_size, last_group_start; |
eb649123 | 603 | |
eb649123 | 604 | for (i = 0; i < rs->md.raid_disks; i++) |
55ebbb59 JB |
605 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
606 | !rs->dev[i].rdev.sb_page) | |
eb649123 JB |
607 | rebuild_cnt++; |
608 | ||
609 | switch (rs->raid_type->level) { | |
610 | case 1: | |
611 | if (rebuild_cnt >= rs->md.raid_disks) | |
612 | goto too_many; | |
613 | break; | |
614 | case 4: | |
615 | case 5: | |
616 | case 6: | |
617 | if (rebuild_cnt > rs->raid_type->parity_devs) | |
618 | goto too_many; | |
619 | break; | |
620 | case 10: | |
4ec1e369 JB |
621 | copies = raid10_md_layout_to_copies(rs->md.layout); |
622 | if (rebuild_cnt < copies) | |
623 | break; | |
624 | ||
625 | /* | |
626 | * It is possible to have a higher rebuild count for RAID10, | |
627 | * as long as the failed devices occur in different mirror | |
628 | * groups (i.e. different stripes). | |
629 | * | |
4ec1e369 JB |
630 | * When checking "near" format, make sure no adjacent devices |
631 | * have failed beyond what can be handled. In addition to the | |
632 | * simple case where the number of devices is a multiple of the | |
633 | * number of copies, we must also handle cases where the number | |
634 | * of devices is not a multiple of the number of copies. | |
635 | * E.g. dev1 dev2 dev3 dev4 dev5 | |
636 | * A A B B C | |
637 | * C D D E E | |
638 | */ | |
fe5d2f4a JB |
639 | if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) { |
640 | for (i = 0; i < rs->md.raid_disks * copies; i++) { | |
641 | if (!(i % copies)) | |
642 | rebuilds_per_group = 0; | |
643 | d = i % rs->md.raid_disks; | |
644 | if ((!rs->dev[d].rdev.sb_page || | |
645 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && | |
646 | (++rebuilds_per_group >= copies)) | |
647 | goto too_many; | |
648 | } | |
649 | break; | |
650 | } | |
651 | ||
652 | /* | |
653 | * When checking "far" and "offset" formats, we need to ensure | |
654 | * that the device that holds its copy is not also dead or | |
655 | * being rebuilt. (Note that "far" and "offset" formats only | |
656 | * support two copies right now. These formats also only ever | |
657 | * use the 'use_far_sets' variant.) | |
658 | * | |
659 | * This check is somewhat complicated by the need to account | |
660 | * for arrays that are not a multiple of (far) copies. This | |
661 | * results in the need to treat the last (potentially larger) | |
662 | * set differently. | |
663 | */ | |
664 | group_size = (rs->md.raid_disks / copies); | |
665 | last_group_start = (rs->md.raid_disks / group_size) - 1; | |
666 | last_group_start *= group_size; | |
667 | for (i = 0; i < rs->md.raid_disks; i++) { | |
668 | if (!(i % copies) && !(i > last_group_start)) | |
55ebbb59 | 669 | rebuilds_per_group = 0; |
fe5d2f4a JB |
670 | if ((!rs->dev[i].rdev.sb_page || |
671 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && | |
4ec1e369 | 672 | (++rebuilds_per_group >= copies)) |
fe5d2f4a | 673 | goto too_many; |
4ec1e369 JB |
674 | } |
675 | break; | |
eb649123 | 676 | default: |
55ebbb59 JB |
677 | if (rebuild_cnt) |
678 | return -EINVAL; | |
eb649123 JB |
679 | } |
680 | ||
681 | return 0; | |
682 | ||
683 | too_many: | |
eb649123 JB |
684 | return -EINVAL; |
685 | } | |
686 | ||
9d09e663 N |
687 | /* |
688 | * Possible arguments are... | |
9d09e663 N |
689 | * <chunk_size> [optional_args] |
690 | * | |
32737279 JB |
691 | * Argument definitions |
692 | * <chunk_size> The number of sectors per disk that | |
693 | * will form the "stripe" | |
694 | * [[no]sync] Force or prevent recovery of the | |
695 | * entire array | |
9d09e663 | 696 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 JB |
697 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
698 | * clear bits | |
9d09e663 N |
699 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
700 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 701 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
702 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
703 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
c1084561 | 704 | * [region_size <sectors>] Defines granularity of bitmap |
63f33b8d JB |
705 | * |
706 | * RAID10-only options: | |
707 | * [raid10_copies <# copies>] Number of copies. (Default: 2) | |
fe5d2f4a | 708 | * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) |
9d09e663 | 709 | */ |
92c83d79 | 710 | static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as, |
9d09e663 N |
711 | unsigned num_raid_params) |
712 | { | |
63f33b8d JB |
713 | char *raid10_format = "near"; |
714 | unsigned raid10_copies = 2; | |
eb649123 | 715 | unsigned i; |
92c83d79 | 716 | unsigned value, region_size = 0; |
c039c332 | 717 | sector_t sectors_per_dev = rs->ti->len; |
542f9038 | 718 | sector_t max_io_len; |
92c83d79 | 719 | const char *arg, *key; |
702108d1 | 720 | struct raid_dev *rd; |
92c83d79 HM |
721 | |
722 | arg = dm_shift_arg(as); | |
723 | num_raid_params--; /* Account for chunk_size argument */ | |
724 | ||
702108d1 HM |
725 | if (kstrtouint(arg, 10, &value) < 0) |
726 | return ti_error_einval(rs->ti, "Bad numerical argument given for chunk_size"); | |
9d09e663 N |
727 | |
728 | /* | |
729 | * First, parse the in-order required arguments | |
32737279 | 730 | * "chunk_size" is the only argument of this type. |
9d09e663 | 731 | */ |
676fa5ad | 732 | if (rt_is_raid1(rs->raid_type)) { |
32737279 JB |
733 | if (value) |
734 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
735 | value = 0; | |
702108d1 HM |
736 | } else if (!is_power_of_2(value)) |
737 | return ti_error_einval(rs->ti, "Chunk size must be a power of 2"); | |
738 | else if (value < 8) | |
739 | return ti_error_einval(rs->ti, "Chunk size value is too small"); | |
9d09e663 N |
740 | |
741 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
9d09e663 N |
742 | |
743 | /* | |
b12d437b JB |
744 | * We set each individual device as In_sync with a completed |
745 | * 'recovery_offset'. If there has been a device failure or | |
746 | * replacement then one of the following cases applies: | |
747 | * | |
748 | * 1) User specifies 'rebuild'. | |
749 | * - Device is reset when param is read. | |
750 | * 2) A new device is supplied. | |
751 | * - No matching superblock found, resets device. | |
752 | * 3) Device failure was transient and returns on reload. | |
753 | * - Failure noticed, resets device for bitmap replay. | |
754 | * 4) Device hadn't completed recovery after previous failure. | |
755 | * - Superblock is read and overrides recovery_offset. | |
756 | * | |
757 | * What is found in the superblocks of the devices is always | |
758 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 759 | */ |
b12d437b | 760 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 761 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
762 | rs->dev[i].rdev.recovery_offset = MaxSector; |
763 | } | |
9d09e663 | 764 | |
b12d437b JB |
765 | /* |
766 | * Second, parse the unordered optional arguments | |
767 | */ | |
9d09e663 | 768 | for (i = 0; i < num_raid_params; i++) { |
92c83d79 | 769 | arg = dm_shift_arg(as); |
702108d1 HM |
770 | if (!arg) |
771 | return ti_error_einval(rs->ti, "Not enough raid parameters given"); | |
92c83d79 HM |
772 | |
773 | if (!strcasecmp(arg, "nosync")) { | |
9d09e663 | 774 | rs->md.recovery_cp = MaxSector; |
702108d1 | 775 | _set_flag(CTR_FLAG_NOSYNC, &rs->ctr_flags); |
9d09e663 N |
776 | continue; |
777 | } | |
92c83d79 | 778 | if (!strcasecmp(arg, "sync")) { |
9d09e663 | 779 | rs->md.recovery_cp = 0; |
702108d1 | 780 | _set_flag(CTR_FLAG_SYNC, &rs->ctr_flags); |
9d09e663 N |
781 | continue; |
782 | } | |
783 | ||
92c83d79 HM |
784 | key = arg; |
785 | arg = dm_shift_arg(as); | |
786 | i++; /* Account for the argument pairs */ | |
702108d1 HM |
787 | if (!arg) |
788 | return ti_error_einval(rs->ti, "Wrong number of raid parameters given"); | |
63f33b8d | 789 | |
702108d1 HM |
790 | /* |
791 | * Parameters that take a string value are checked here. | |
792 | */ | |
793 | ||
794 | if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_RAID10_FORMAT))) { | |
795 | if (_test_and_set_flag(CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) | |
796 | return ti_error_einval(rs->ti, "Only one raid10_format argument pair allowed"); | |
676fa5ad | 797 | if (!rt_is_raid10(rs->raid_type)) |
702108d1 | 798 | return ti_error_einval(rs->ti, "'raid10_format' is an invalid parameter for this RAID type"); |
92c83d79 HM |
799 | if (strcmp("near", arg) && |
800 | strcmp("far", arg) && | |
702108d1 HM |
801 | strcmp("offset", arg)) |
802 | return ti_error_einval(rs->ti, "Invalid 'raid10_format' value given"); | |
803 | ||
92c83d79 | 804 | raid10_format = (char *) arg; |
63f33b8d JB |
805 | continue; |
806 | } | |
807 | ||
702108d1 HM |
808 | if (kstrtouint(arg, 10, &value) < 0) |
809 | return ti_error_einval(rs->ti, "Bad numerical argument given in raid params"); | |
810 | ||
811 | if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_REBUILD))) { | |
812 | /* | |
813 | * "rebuild" is being passed in by userspace to provide | |
814 | * indexes of replaced devices and to set up additional | |
815 | * devices on raid level takeover. | |
816 | */ | |
817 | if (!_in_range(value, 0, rs->md.raid_disks - 1)) | |
818 | return ti_error_einval(rs->ti, "Invalid rebuild index given"); | |
819 | ||
820 | rd = rs->dev + value; | |
821 | clear_bit(In_sync, &rd->rdev.flags); | |
822 | clear_bit(Faulty, &rd->rdev.flags); | |
823 | rd->rdev.recovery_offset = 0; | |
824 | _set_flag(CTR_FLAG_REBUILD, &rs->ctr_flags); | |
825 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_WRITE_MOSTLY))) { | |
676fa5ad | 826 | if (!rt_is_raid1(rs->raid_type)) |
702108d1 HM |
827 | return ti_error_einval(rs->ti, "write_mostly option is only valid for RAID1"); |
828 | ||
829 | if (!_in_range(value, 0, rs->md.raid_disks - 1)) | |
830 | return ti_error_einval(rs->ti, "Invalid write_mostly index given"); | |
9d09e663 | 831 | |
46bed2b5 | 832 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); |
702108d1 HM |
833 | _set_flag(CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags); |
834 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) { | |
676fa5ad | 835 | if (!rt_is_raid1(rs->raid_type)) |
702108d1 HM |
836 | return ti_error_einval(rs->ti, "max_write_behind option is only valid for RAID1"); |
837 | ||
838 | if (_test_and_set_flag(CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) | |
839 | return ti_error_einval(rs->ti, "Only one max_write_behind argument pair allowed"); | |
9d09e663 N |
840 | |
841 | /* | |
842 | * In device-mapper, we specify things in sectors, but | |
843 | * MD records this value in kB | |
844 | */ | |
845 | value /= 2; | |
702108d1 HM |
846 | if (value > COUNTER_MAX) |
847 | return ti_error_einval(rs->ti, "Max write-behind limit out of range"); | |
848 | ||
9d09e663 | 849 | rs->md.bitmap_info.max_write_behind = value; |
702108d1 HM |
850 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_DAEMON_SLEEP))) { |
851 | if (_test_and_set_flag(CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) | |
852 | return ti_error_einval(rs->ti, "Only one daemon_sleep argument pair allowed"); | |
853 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) | |
854 | return ti_error_einval(rs->ti, "daemon sleep period out of range"); | |
9d09e663 | 855 | rs->md.bitmap_info.daemon_sleep = value; |
702108d1 HM |
856 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_STRIPE_CACHE))) { |
857 | if (_test_and_set_flag(CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) | |
858 | return ti_error_einval(rs->ti, "Only one stripe_cache argument pair allowed"); | |
9d09e663 N |
859 | /* |
860 | * In device-mapper, we specify things in sectors, but | |
861 | * MD records this value in kB | |
862 | */ | |
863 | value /= 2; | |
864 | ||
676fa5ad | 865 | if (!rt_is_raid456(rs->raid_type)) |
702108d1 HM |
866 | return ti_error_einval(rs->ti, "Inappropriate argument: stripe_cache"); |
867 | if (raid5_set_cache_size(&rs->md, (int)value)) | |
868 | return ti_error_einval(rs->ti, "Bad stripe_cache size"); | |
869 | ||
870 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) { | |
871 | if (_test_and_set_flag(CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) | |
872 | return ti_error_einval(rs->ti, "Only one min_recovery_rate argument pair allowed"); | |
873 | if (value > INT_MAX) | |
874 | return ti_error_einval(rs->ti, "min_recovery_rate out of range"); | |
9d09e663 | 875 | rs->md.sync_speed_min = (int)value; |
702108d1 HM |
876 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) { |
877 | if (_test_and_set_flag(CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) | |
878 | return ti_error_einval(rs->ti, "Only one max_recovery_rate argument pair allowed"); | |
879 | if (value > INT_MAX) | |
880 | return ti_error_einval(rs->ti, "max_recovery_rate out of range"); | |
9d09e663 | 881 | rs->md.sync_speed_max = (int)value; |
702108d1 HM |
882 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_REGION_SIZE))) { |
883 | if (_test_and_set_flag(CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) | |
884 | return ti_error_einval(rs->ti, "Only one region_size argument pair allowed"); | |
885 | ||
c1084561 | 886 | region_size = value; |
702108d1 HM |
887 | } else if (!strcasecmp(key, _argname_by_flag(CTR_FLAG_RAID10_COPIES))) { |
888 | if (_test_and_set_flag(CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) | |
889 | return ti_error_einval(rs->ti, "Only one raid10_copies argument pair allowed"); | |
890 | ||
891 | if (!_in_range(value, 2, rs->md.raid_disks)) | |
892 | return ti_error_einval(rs->ti, "Bad value for 'raid10_copies'"); | |
893 | ||
63f33b8d | 894 | raid10_copies = value; |
9d09e663 N |
895 | } else { |
896 | DMERR("Unable to parse RAID parameter: %s", key); | |
702108d1 | 897 | return ti_error_einval(rs->ti, "Unable to parse RAID parameters"); |
9d09e663 N |
898 | } |
899 | } | |
900 | ||
c1084561 JB |
901 | if (validate_region_size(rs, region_size)) |
902 | return -EINVAL; | |
903 | ||
904 | if (rs->md.chunk_sectors) | |
542f9038 | 905 | max_io_len = rs->md.chunk_sectors; |
c1084561 | 906 | else |
542f9038 | 907 | max_io_len = region_size; |
c1084561 | 908 | |
542f9038 MS |
909 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
910 | return -EINVAL; | |
32737279 | 911 | |
676fa5ad | 912 | if (rt_is_raid10(rs->raid_type)) { |
702108d1 HM |
913 | if (raid10_copies > rs->md.raid_disks) |
914 | return ti_error_einval(rs->ti, "Not enough devices to satisfy specification"); | |
63f33b8d | 915 | |
fe5d2f4a JB |
916 | /* |
917 | * If the format is not "near", we only support | |
918 | * two copies at the moment. | |
919 | */ | |
702108d1 HM |
920 | if (strcmp("near", raid10_format) && (raid10_copies > 2)) |
921 | return ti_error_einval(rs->ti, "Too many copies for given RAID10 format."); | |
fe5d2f4a | 922 | |
63f33b8d JB |
923 | /* (Len * #mirrors) / #devices */ |
924 | sectors_per_dev = rs->ti->len * raid10_copies; | |
925 | sector_div(sectors_per_dev, rs->md.raid_disks); | |
926 | ||
927 | rs->md.layout = raid10_format_to_md_layout(raid10_format, | |
928 | raid10_copies); | |
929 | rs->md.new_layout = rs->md.layout; | |
676fa5ad | 930 | } else if (!rt_is_raid1(rs->raid_type) && |
63f33b8d | 931 | sector_div(sectors_per_dev, |
702108d1 HM |
932 | (rs->md.raid_disks - rs->raid_type->parity_devs))) |
933 | return ti_error_einval(rs->ti, "Target length not divisible by number of data devices"); | |
934 | ||
c039c332 JB |
935 | rs->md.dev_sectors = sectors_per_dev; |
936 | ||
9d09e663 N |
937 | /* Assume there are no metadata devices until the drives are parsed */ |
938 | rs->md.persistent = 0; | |
939 | rs->md.external = 1; | |
940 | ||
f090279e HM |
941 | /* Check, if any invalid ctr arguments have been passed in for the raid level */ |
942 | return rs_check_for_invalid_flags(rs); | |
9d09e663 N |
943 | } |
944 | ||
945 | static void do_table_event(struct work_struct *ws) | |
946 | { | |
947 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
948 | ||
949 | dm_table_event(rs->ti->table); | |
950 | } | |
951 | ||
952 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
953 | { | |
954 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
955 | ||
5c675f83 | 956 | return mddev_congested(&rs->md, bits); |
9d09e663 N |
957 | } |
958 | ||
b12d437b JB |
959 | /* |
960 | * This structure is never routinely used by userspace, unlike md superblocks. | |
961 | * Devices with this superblock should only ever be accessed via device-mapper. | |
962 | */ | |
963 | #define DM_RAID_MAGIC 0x64526D44 | |
964 | struct dm_raid_superblock { | |
965 | __le32 magic; /* "DmRd" */ | |
966 | __le32 features; /* Used to indicate possible future changes */ | |
967 | ||
968 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ | |
969 | __le32 array_position; /* The position of this drive in the array */ | |
970 | ||
971 | __le64 events; /* Incremented by md when superblock updated */ | |
972 | __le64 failed_devices; /* Bit field of devices to indicate failures */ | |
973 | ||
974 | /* | |
975 | * This offset tracks the progress of the repair or replacement of | |
976 | * an individual drive. | |
977 | */ | |
978 | __le64 disk_recovery_offset; | |
979 | ||
980 | /* | |
981 | * This offset tracks the progress of the initial array | |
982 | * synchronisation/parity calculation. | |
983 | */ | |
984 | __le64 array_resync_offset; | |
985 | ||
986 | /* | |
987 | * RAID characteristics | |
988 | */ | |
989 | __le32 level; | |
990 | __le32 layout; | |
991 | __le32 stripe_sectors; | |
992 | ||
40d43c4b | 993 | /* Remainder of a logical block is zero-filled when writing (see super_sync()). */ |
b12d437b JB |
994 | } __packed; |
995 | ||
3cb03002 | 996 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
997 | { |
998 | BUG_ON(!rdev->sb_page); | |
999 | ||
1000 | if (rdev->sb_loaded) | |
1001 | return 0; | |
1002 | ||
796a5cf0 | 1003 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, 1)) { |
0447568f JB |
1004 | DMERR("Failed to read superblock of device at position %d", |
1005 | rdev->raid_disk); | |
c32fb9e7 | 1006 | md_error(rdev->mddev, rdev); |
b12d437b JB |
1007 | return -EINVAL; |
1008 | } | |
1009 | ||
1010 | rdev->sb_loaded = 1; | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
fd01b88c | 1015 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 1016 | { |
81f382f9 | 1017 | int i; |
b12d437b JB |
1018 | uint64_t failed_devices; |
1019 | struct dm_raid_superblock *sb; | |
81f382f9 | 1020 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
b12d437b JB |
1021 | |
1022 | sb = page_address(rdev->sb_page); | |
1023 | failed_devices = le64_to_cpu(sb->failed_devices); | |
1024 | ||
81f382f9 JB |
1025 | for (i = 0; i < mddev->raid_disks; i++) |
1026 | if (!rs->dev[i].data_dev || | |
1027 | test_bit(Faulty, &(rs->dev[i].rdev.flags))) | |
1028 | failed_devices |= (1ULL << i); | |
b12d437b | 1029 | |
40d43c4b | 1030 | memset(sb + 1, 0, rdev->sb_size - sizeof(*sb)); |
b12d437b JB |
1031 | |
1032 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
1033 | sb->features = cpu_to_le32(0); /* No features yet */ | |
1034 | ||
1035 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
1036 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
1037 | ||
1038 | sb->events = cpu_to_le64(mddev->events); | |
1039 | sb->failed_devices = cpu_to_le64(failed_devices); | |
1040 | ||
1041 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1042 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1043 | ||
1044 | sb->level = cpu_to_le32(mddev->level); | |
1045 | sb->layout = cpu_to_le32(mddev->layout); | |
1046 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * super_load | |
1051 | * | |
1052 | * This function creates a superblock if one is not found on the device | |
1053 | * and will decide which superblock to use if there's a choice. | |
1054 | * | |
1055 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
1056 | */ | |
3cb03002 | 1057 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b | 1058 | { |
73c6f239 | 1059 | int r; |
b12d437b JB |
1060 | struct dm_raid_superblock *sb; |
1061 | struct dm_raid_superblock *refsb; | |
1062 | uint64_t events_sb, events_refsb; | |
1063 | ||
1064 | rdev->sb_start = 0; | |
40d43c4b HM |
1065 | rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev); |
1066 | if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) { | |
1067 | DMERR("superblock size of a logical block is no longer valid"); | |
1068 | return -EINVAL; | |
1069 | } | |
b12d437b | 1070 | |
73c6f239 HM |
1071 | r = read_disk_sb(rdev, rdev->sb_size); |
1072 | if (r) | |
1073 | return r; | |
b12d437b JB |
1074 | |
1075 | sb = page_address(rdev->sb_page); | |
3aa3b2b2 JB |
1076 | |
1077 | /* | |
1078 | * Two cases that we want to write new superblocks and rebuild: | |
1079 | * 1) New device (no matching magic number) | |
1080 | * 2) Device specified for rebuild (!In_sync w/ offset == 0) | |
1081 | */ | |
1082 | if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || | |
1083 | (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { | |
b12d437b JB |
1084 | super_sync(rdev->mddev, rdev); |
1085 | ||
1086 | set_bit(FirstUse, &rdev->flags); | |
1087 | ||
1088 | /* Force writing of superblocks to disk */ | |
1089 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); | |
1090 | ||
1091 | /* Any superblock is better than none, choose that if given */ | |
1092 | return refdev ? 0 : 1; | |
1093 | } | |
1094 | ||
1095 | if (!refdev) | |
1096 | return 1; | |
1097 | ||
1098 | events_sb = le64_to_cpu(sb->events); | |
1099 | ||
1100 | refsb = page_address(refdev->sb_page); | |
1101 | events_refsb = le64_to_cpu(refsb->events); | |
1102 | ||
1103 | return (events_sb > events_refsb) ? 1 : 0; | |
1104 | } | |
1105 | ||
fd01b88c | 1106 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
1107 | { |
1108 | int role; | |
1109 | struct raid_set *rs = container_of(mddev, struct raid_set, md); | |
1110 | uint64_t events_sb; | |
1111 | uint64_t failed_devices; | |
1112 | struct dm_raid_superblock *sb; | |
1113 | uint32_t new_devs = 0; | |
1114 | uint32_t rebuilds = 0; | |
dafb20fa | 1115 | struct md_rdev *r; |
b12d437b JB |
1116 | struct dm_raid_superblock *sb2; |
1117 | ||
1118 | sb = page_address(rdev->sb_page); | |
1119 | events_sb = le64_to_cpu(sb->events); | |
1120 | failed_devices = le64_to_cpu(sb->failed_devices); | |
1121 | ||
1122 | /* | |
1123 | * Initialise to 1 if this is a new superblock. | |
1124 | */ | |
1125 | mddev->events = events_sb ? : 1; | |
1126 | ||
1127 | /* | |
1128 | * Reshaping is not currently allowed | |
1129 | */ | |
fe5d2f4a JB |
1130 | if (le32_to_cpu(sb->level) != mddev->level) { |
1131 | DMERR("Reshaping arrays not yet supported. (RAID level change)"); | |
1132 | return -EINVAL; | |
1133 | } | |
1134 | if (le32_to_cpu(sb->layout) != mddev->layout) { | |
1135 | DMERR("Reshaping arrays not yet supported. (RAID layout change)"); | |
1136 | DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); | |
1137 | DMERR(" Old layout: %s w/ %d copies", | |
1138 | raid10_md_layout_to_format(le32_to_cpu(sb->layout)), | |
1139 | raid10_md_layout_to_copies(le32_to_cpu(sb->layout))); | |
1140 | DMERR(" New layout: %s w/ %d copies", | |
1141 | raid10_md_layout_to_format(mddev->layout), | |
1142 | raid10_md_layout_to_copies(mddev->layout)); | |
1143 | return -EINVAL; | |
1144 | } | |
1145 | if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) { | |
1146 | DMERR("Reshaping arrays not yet supported. (stripe sectors change)"); | |
b12d437b JB |
1147 | return -EINVAL; |
1148 | } | |
1149 | ||
1150 | /* We can only change the number of devices in RAID1 right now */ | |
676fa5ad | 1151 | if (!rt_is_raid1(rs->raid_type) && |
b12d437b | 1152 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { |
fe5d2f4a | 1153 | DMERR("Reshaping arrays not yet supported. (device count change)"); |
b12d437b JB |
1154 | return -EINVAL; |
1155 | } | |
1156 | ||
ad51d7f1 | 1157 | if (!(_test_flags(CTR_FLAGS_ANY_SYNC, rs->ctr_flags))) |
b12d437b JB |
1158 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); |
1159 | ||
1160 | /* | |
1161 | * During load, we set FirstUse if a new superblock was written. | |
1162 | * There are two reasons we might not have a superblock: | |
1163 | * 1) The array is brand new - in which case, all of the | |
1164 | * devices must have their In_sync bit set. Also, | |
1165 | * recovery_cp must be 0, unless forced. | |
1166 | * 2) This is a new device being added to an old array | |
1167 | * and the new device needs to be rebuilt - in which | |
1168 | * case the In_sync bit will /not/ be set and | |
1169 | * recovery_cp must be MaxSector. | |
1170 | */ | |
dafb20fa | 1171 | rdev_for_each(r, mddev) { |
b12d437b | 1172 | if (!test_bit(In_sync, &r->flags)) { |
3aa3b2b2 JB |
1173 | DMINFO("Device %d specified for rebuild: " |
1174 | "Clearing superblock", r->raid_disk); | |
b12d437b JB |
1175 | rebuilds++; |
1176 | } else if (test_bit(FirstUse, &r->flags)) | |
1177 | new_devs++; | |
1178 | } | |
1179 | ||
1180 | if (!rebuilds) { | |
1181 | if (new_devs == mddev->raid_disks) { | |
1182 | DMINFO("Superblocks created for new array"); | |
1183 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
1184 | } else if (new_devs) { | |
1185 | DMERR("New device injected " | |
1186 | "into existing array without 'rebuild' " | |
1187 | "parameter specified"); | |
1188 | return -EINVAL; | |
1189 | } | |
1190 | } else if (new_devs) { | |
1191 | DMERR("'rebuild' devices cannot be " | |
1192 | "injected into an array with other first-time devices"); | |
1193 | return -EINVAL; | |
1194 | } else if (mddev->recovery_cp != MaxSector) { | |
1195 | DMERR("'rebuild' specified while array is not in-sync"); | |
1196 | return -EINVAL; | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * Now we set the Faulty bit for those devices that are | |
1201 | * recorded in the superblock as failed. | |
1202 | */ | |
dafb20fa | 1203 | rdev_for_each(r, mddev) { |
b12d437b JB |
1204 | if (!r->sb_page) |
1205 | continue; | |
1206 | sb2 = page_address(r->sb_page); | |
1207 | sb2->failed_devices = 0; | |
1208 | ||
1209 | /* | |
1210 | * Check for any device re-ordering. | |
1211 | */ | |
1212 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { | |
1213 | role = le32_to_cpu(sb2->array_position); | |
1214 | if (role != r->raid_disk) { | |
676fa5ad | 1215 | if (!rt_is_raid1(rs->raid_type)) |
702108d1 HM |
1216 | return ti_error_einval(rs->ti, "Cannot change device " |
1217 | "positions in RAID array"); | |
b12d437b JB |
1218 | DMINFO("RAID1 device #%d now at position #%d", |
1219 | role, r->raid_disk); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Partial recovery is performed on | |
1224 | * returning failed devices. | |
1225 | */ | |
1226 | if (failed_devices & (1 << role)) | |
1227 | set_bit(Faulty, &r->flags); | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
0cf45031 | 1234 | static int super_validate(struct raid_set *rs, struct md_rdev *rdev) |
b12d437b | 1235 | { |
0cf45031 | 1236 | struct mddev *mddev = &rs->md; |
b12d437b JB |
1237 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); |
1238 | ||
1239 | /* | |
1240 | * If mddev->events is not set, we know we have not yet initialized | |
1241 | * the array. | |
1242 | */ | |
1243 | if (!mddev->events && super_init_validation(mddev, rdev)) | |
1244 | return -EINVAL; | |
1245 | ||
4c9971ca HM |
1246 | if (le32_to_cpu(sb->features)) { |
1247 | rs->ti->error = "Unable to assemble array: No feature flags supported yet"; | |
1248 | return -EINVAL; | |
1249 | } | |
1250 | ||
0cf45031 | 1251 | /* Enable bitmap creation for RAID levels != 0 */ |
676fa5ad | 1252 | mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096); |
0cf45031 HM |
1253 | rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset; |
1254 | ||
b12d437b JB |
1255 | if (!test_bit(FirstUse, &rdev->flags)) { |
1256 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); | |
1257 | if (rdev->recovery_offset != MaxSector) | |
1258 | clear_bit(In_sync, &rdev->flags); | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * If a device comes back, set it as not In_sync and no longer faulty. | |
1263 | */ | |
1264 | if (test_bit(Faulty, &rdev->flags)) { | |
1265 | clear_bit(Faulty, &rdev->flags); | |
1266 | clear_bit(In_sync, &rdev->flags); | |
1267 | rdev->saved_raid_disk = rdev->raid_disk; | |
1268 | rdev->recovery_offset = 0; | |
1269 | } | |
1270 | ||
1271 | clear_bit(FirstUse, &rdev->flags); | |
1272 | ||
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * Analyse superblocks and select the freshest. | |
1278 | */ | |
1279 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
1280 | { | |
73c6f239 | 1281 | int r; |
0447568f | 1282 | struct raid_dev *dev; |
a9ad8526 | 1283 | struct md_rdev *rdev, *tmp, *freshest; |
fd01b88c | 1284 | struct mddev *mddev = &rs->md; |
b12d437b JB |
1285 | |
1286 | freshest = NULL; | |
a9ad8526 | 1287 | rdev_for_each_safe(rdev, tmp, mddev) { |
761becff | 1288 | /* |
c76d53f4 | 1289 | * Skipping super_load due to CTR_FLAG_SYNC will cause |
761becff JB |
1290 | * the array to undergo initialization again as |
1291 | * though it were new. This is the intended effect | |
1292 | * of the "sync" directive. | |
1293 | * | |
1294 | * When reshaping capability is added, we must ensure | |
1295 | * that the "sync" directive is disallowed during the | |
1296 | * reshape. | |
1297 | */ | |
0cf45031 HM |
1298 | rdev->sectors = to_sector(i_size_read(rdev->bdev->bd_inode)); |
1299 | ||
ad51d7f1 | 1300 | if (_test_flag(CTR_FLAG_SYNC, rs->ctr_flags)) |
761becff JB |
1301 | continue; |
1302 | ||
b12d437b JB |
1303 | if (!rdev->meta_bdev) |
1304 | continue; | |
1305 | ||
73c6f239 | 1306 | r = super_load(rdev, freshest); |
b12d437b | 1307 | |
73c6f239 | 1308 | switch (r) { |
b12d437b JB |
1309 | case 1: |
1310 | freshest = rdev; | |
1311 | break; | |
1312 | case 0: | |
1313 | break; | |
1314 | default: | |
0447568f | 1315 | dev = container_of(rdev, struct raid_dev, rdev); |
55ebbb59 JB |
1316 | if (dev->meta_dev) |
1317 | dm_put_device(ti, dev->meta_dev); | |
0447568f | 1318 | |
55ebbb59 JB |
1319 | dev->meta_dev = NULL; |
1320 | rdev->meta_bdev = NULL; | |
0447568f | 1321 | |
55ebbb59 JB |
1322 | if (rdev->sb_page) |
1323 | put_page(rdev->sb_page); | |
0447568f | 1324 | |
55ebbb59 | 1325 | rdev->sb_page = NULL; |
0447568f | 1326 | |
55ebbb59 | 1327 | rdev->sb_loaded = 0; |
0447568f | 1328 | |
55ebbb59 JB |
1329 | /* |
1330 | * We might be able to salvage the data device | |
1331 | * even though the meta device has failed. For | |
1332 | * now, we behave as though '- -' had been | |
1333 | * set for this device in the table. | |
1334 | */ | |
1335 | if (dev->data_dev) | |
1336 | dm_put_device(ti, dev->data_dev); | |
0447568f | 1337 | |
55ebbb59 JB |
1338 | dev->data_dev = NULL; |
1339 | rdev->bdev = NULL; | |
0447568f | 1340 | |
55ebbb59 | 1341 | list_del(&rdev->same_set); |
b12d437b JB |
1342 | } |
1343 | } | |
1344 | ||
1345 | if (!freshest) | |
1346 | return 0; | |
1347 | ||
702108d1 HM |
1348 | if (validate_raid_redundancy(rs)) |
1349 | return ti_error_einval(rs->ti, "Insufficient redundancy to activate array"); | |
55ebbb59 | 1350 | |
b12d437b JB |
1351 | /* |
1352 | * Validation of the freshest device provides the source of | |
1353 | * validation for the remaining devices. | |
1354 | */ | |
0cf45031 | 1355 | if (super_validate(rs, freshest)) |
702108d1 | 1356 | return ti_error_einval(rs->ti, "Unable to assemble array: Invalid superblocks"); |
b12d437b | 1357 | |
dafb20fa | 1358 | rdev_for_each(rdev, mddev) |
0cf45031 | 1359 | if ((rdev != freshest) && super_validate(rs, rdev)) |
b12d437b JB |
1360 | return -EINVAL; |
1361 | ||
1362 | return 0; | |
1363 | } | |
1364 | ||
75b8e04b | 1365 | /* |
48cf06bc HM |
1366 | * Enable/disable discard support on RAID set depending on |
1367 | * RAID level and discard properties of underlying RAID members. | |
75b8e04b HM |
1368 | */ |
1369 | static void configure_discard_support(struct dm_target *ti, struct raid_set *rs) | |
1370 | { | |
48cf06bc HM |
1371 | int i; |
1372 | bool raid456; | |
1373 | ||
75b8e04b HM |
1374 | /* Assume discards not supported until after checks below. */ |
1375 | ti->discards_supported = false; | |
1376 | ||
1377 | /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */ | |
48cf06bc | 1378 | raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6); |
75b8e04b | 1379 | |
48cf06bc | 1380 | for (i = 0; i < rs->md.raid_disks; i++) { |
d20c4b08 | 1381 | struct request_queue *q; |
48cf06bc | 1382 | |
d20c4b08 HM |
1383 | if (!rs->dev[i].rdev.bdev) |
1384 | continue; | |
1385 | ||
1386 | q = bdev_get_queue(rs->dev[i].rdev.bdev); | |
48cf06bc HM |
1387 | if (!q || !blk_queue_discard(q)) |
1388 | return; | |
1389 | ||
1390 | if (raid456) { | |
1391 | if (!q->limits.discard_zeroes_data) | |
1392 | return; | |
1393 | if (!devices_handle_discard_safely) { | |
1394 | DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty."); | |
1395 | DMERR("Set dm-raid.devices_handle_discard_safely=Y to override."); | |
1396 | return; | |
1397 | } | |
1398 | } | |
1399 | } | |
1400 | ||
1401 | /* All RAID members properly support discards */ | |
75b8e04b HM |
1402 | ti->discards_supported = true; |
1403 | ||
1404 | /* | |
1405 | * RAID1 and RAID10 personalities require bio splitting, | |
48cf06bc | 1406 | * RAID0/4/5/6 don't and process large discard bios properly. |
75b8e04b | 1407 | */ |
48cf06bc | 1408 | ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10); |
75b8e04b HM |
1409 | ti->num_discard_bios = 1; |
1410 | } | |
1411 | ||
9d09e663 | 1412 | /* |
73c6f239 | 1413 | * Construct a RAID0/1/10/4/5/6 mapping: |
9d09e663 | 1414 | * Args: |
73c6f239 HM |
1415 | * <raid_type> <#raid_params> <raid_params>{0,} \ |
1416 | * <#raid_devs> [<meta_dev1> <dev1>]{1,} | |
9d09e663 | 1417 | * |
9d09e663 N |
1418 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
1419 | * details on possible <raid_params>. | |
73c6f239 HM |
1420 | * |
1421 | * Userspace is free to initialize the metadata devices, hence the superblocks to | |
1422 | * enforce recreation based on the passed in table parameters. | |
1423 | * | |
9d09e663 N |
1424 | */ |
1425 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
1426 | { | |
73c6f239 | 1427 | int r; |
9d09e663 | 1428 | struct raid_type *rt; |
92c83d79 | 1429 | unsigned num_raid_params, num_raid_devs; |
9d09e663 | 1430 | struct raid_set *rs = NULL; |
92c83d79 HM |
1431 | const char *arg; |
1432 | struct dm_arg_set as = { argc, argv }, as_nrd; | |
1433 | struct dm_arg _args[] = { | |
1434 | { 0, as.argc, "Cannot understand number of raid parameters" }, | |
1435 | { 1, 254, "Cannot understand number of raid devices parameters" } | |
1436 | }; | |
1437 | ||
1438 | /* Must have <raid_type> */ | |
1439 | arg = dm_shift_arg(&as); | |
702108d1 HM |
1440 | if (!arg) |
1441 | return ti_error_einval(rs->ti, "No arguments"); | |
9d09e663 | 1442 | |
92c83d79 | 1443 | rt = get_raid_type(arg); |
702108d1 HM |
1444 | if (!rt) |
1445 | return ti_error_einval(rs->ti, "Unrecognised raid_type"); | |
9d09e663 | 1446 | |
92c83d79 HM |
1447 | /* Must have <#raid_params> */ |
1448 | if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error)) | |
1449 | return -EINVAL; | |
9d09e663 | 1450 | |
92c83d79 HM |
1451 | /* number of raid device tupples <meta_dev data_dev> */ |
1452 | as_nrd = as; | |
1453 | dm_consume_args(&as_nrd, num_raid_params); | |
1454 | _args[1].max = (as_nrd.argc - 1) / 2; | |
1455 | if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error)) | |
1456 | return -EINVAL; | |
9d09e663 | 1457 | |
702108d1 HM |
1458 | if (!_in_range(num_raid_devs, 1, MAX_RAID_DEVICES)) |
1459 | return ti_error_einval(rs->ti, "Invalid number of supplied raid devices"); | |
3ca5a21a | 1460 | |
92c83d79 | 1461 | rs = context_alloc(ti, rt, num_raid_devs); |
9d09e663 N |
1462 | if (IS_ERR(rs)) |
1463 | return PTR_ERR(rs); | |
1464 | ||
92c83d79 | 1465 | r = parse_raid_params(rs, &as, num_raid_params); |
73c6f239 | 1466 | if (r) |
9d09e663 N |
1467 | goto bad; |
1468 | ||
702108d1 | 1469 | r = parse_dev_params(rs, &as); |
73c6f239 | 1470 | if (r) |
9d09e663 N |
1471 | goto bad; |
1472 | ||
b12d437b | 1473 | rs->md.sync_super = super_sync; |
73c6f239 HM |
1474 | r = analyse_superblocks(ti, rs); |
1475 | if (r) | |
b12d437b JB |
1476 | goto bad; |
1477 | ||
9d09e663 | 1478 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 | 1479 | ti->private = rs; |
55a62eef | 1480 | ti->num_flush_bios = 1; |
9d09e663 | 1481 | |
75b8e04b HM |
1482 | /* |
1483 | * Disable/enable discard support on RAID set. | |
1484 | */ | |
1485 | configure_discard_support(ti, rs); | |
1486 | ||
0cf45031 HM |
1487 | /* Has to be held on running the array */ |
1488 | mddev_lock_nointr(&rs->md); | |
73c6f239 | 1489 | r = md_run(&rs->md); |
9d09e663 | 1490 | rs->md.in_sync = 0; /* Assume already marked dirty */ |
0cf45031 | 1491 | mddev_unlock(&rs->md); |
9d09e663 | 1492 | |
73c6f239 | 1493 | if (r) { |
9d09e663 N |
1494 | ti->error = "Fail to run raid array"; |
1495 | goto bad; | |
1496 | } | |
1497 | ||
63f33b8d | 1498 | if (ti->len != rs->md.array_sectors) { |
702108d1 | 1499 | r = ti_error_einval(ti, "Array size does not match requested target length"); |
63f33b8d JB |
1500 | goto size_mismatch; |
1501 | } | |
9d09e663 | 1502 | rs->callbacks.congested_fn = raid_is_congested; |
9d09e663 N |
1503 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
1504 | ||
32737279 | 1505 | mddev_suspend(&rs->md); |
9d09e663 N |
1506 | return 0; |
1507 | ||
63f33b8d JB |
1508 | size_mismatch: |
1509 | md_stop(&rs->md); | |
9d09e663 N |
1510 | bad: |
1511 | context_free(rs); | |
1512 | ||
73c6f239 | 1513 | return r; |
9d09e663 N |
1514 | } |
1515 | ||
1516 | static void raid_dtr(struct dm_target *ti) | |
1517 | { | |
1518 | struct raid_set *rs = ti->private; | |
1519 | ||
1520 | list_del_init(&rs->callbacks.list); | |
1521 | md_stop(&rs->md); | |
1522 | context_free(rs); | |
1523 | } | |
1524 | ||
7de3ee57 | 1525 | static int raid_map(struct dm_target *ti, struct bio *bio) |
9d09e663 N |
1526 | { |
1527 | struct raid_set *rs = ti->private; | |
fd01b88c | 1528 | struct mddev *mddev = &rs->md; |
9d09e663 N |
1529 | |
1530 | mddev->pers->make_request(mddev, bio); | |
1531 | ||
1532 | return DM_MAPIO_SUBMITTED; | |
1533 | } | |
1534 | ||
be83651f JB |
1535 | static const char *decipher_sync_action(struct mddev *mddev) |
1536 | { | |
1537 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
1538 | return "frozen"; | |
1539 | ||
1540 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1541 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { | |
1542 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
1543 | return "reshape"; | |
1544 | ||
1545 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
1546 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1547 | return "resync"; | |
1548 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1549 | return "check"; | |
1550 | return "repair"; | |
1551 | } | |
1552 | ||
1553 | if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
1554 | return "recover"; | |
1555 | } | |
1556 | ||
1557 | return "idle"; | |
1558 | } | |
1559 | ||
fd7c092e MP |
1560 | static void raid_status(struct dm_target *ti, status_type_t type, |
1561 | unsigned status_flags, char *result, unsigned maxlen) | |
9d09e663 N |
1562 | { |
1563 | struct raid_set *rs = ti->private; | |
1564 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ | |
1565 | unsigned sz = 0; | |
2e727c3c | 1566 | int i, array_in_sync = 0; |
9d09e663 N |
1567 | sector_t sync; |
1568 | ||
1569 | switch (type) { | |
1570 | case STATUSTYPE_INFO: | |
1571 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); | |
1572 | ||
676fa5ad | 1573 | if (!rt_is_raid0(rs->raid_type)) { |
0cf45031 HM |
1574 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) |
1575 | sync = rs->md.curr_resync_completed; | |
1576 | else | |
1577 | sync = rs->md.recovery_cp; | |
1578 | ||
1579 | if (sync >= rs->md.resync_max_sectors) { | |
1580 | /* | |
1581 | * Sync complete. | |
1582 | */ | |
1583 | array_in_sync = 1; | |
1584 | sync = rs->md.resync_max_sectors; | |
1585 | } else if (test_bit(MD_RECOVERY_REQUESTED, &rs->md.recovery)) { | |
1586 | /* | |
1587 | * If "check" or "repair" is occurring, the array has | |
1588 | * undergone and initial sync and the health characters | |
1589 | * should not be 'a' anymore. | |
1590 | */ | |
1591 | array_in_sync = 1; | |
1592 | } else { | |
1593 | /* | |
1594 | * The array may be doing an initial sync, or it may | |
1595 | * be rebuilding individual components. If all the | |
1596 | * devices are In_sync, then it is the array that is | |
1597 | * being initialized. | |
1598 | */ | |
1599 | for (i = 0; i < rs->md.raid_disks; i++) | |
1600 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1601 | array_in_sync = 1; | |
1602 | } | |
1603 | } else { | |
1604 | /* RAID0 */ | |
2e727c3c | 1605 | array_in_sync = 1; |
9d09e663 | 1606 | sync = rs->md.resync_max_sectors; |
2e727c3c | 1607 | } |
be83651f | 1608 | |
2e727c3c JB |
1609 | /* |
1610 | * Status characters: | |
1611 | * 'D' = Dead/Failed device | |
1612 | * 'a' = Alive but not in-sync | |
1613 | * 'A' = Alive and in-sync | |
1614 | */ | |
1615 | for (i = 0; i < rs->md.raid_disks; i++) { | |
1616 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) | |
1617 | DMEMIT("D"); | |
1618 | else if (!array_in_sync || | |
1619 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1620 | DMEMIT("a"); | |
1621 | else | |
1622 | DMEMIT("A"); | |
1623 | } | |
9d09e663 | 1624 | |
2e727c3c JB |
1625 | /* |
1626 | * In-sync ratio: | |
1627 | * The in-sync ratio shows the progress of: | |
1628 | * - Initializing the array | |
1629 | * - Rebuilding a subset of devices of the array | |
1630 | * The user can distinguish between the two by referring | |
1631 | * to the status characters. | |
1632 | */ | |
9d09e663 N |
1633 | DMEMIT(" %llu/%llu", |
1634 | (unsigned long long) sync, | |
1635 | (unsigned long long) rs->md.resync_max_sectors); | |
1636 | ||
be83651f JB |
1637 | /* |
1638 | * Sync action: | |
1639 | * See Documentation/device-mapper/dm-raid.c for | |
1640 | * information on each of these states. | |
1641 | */ | |
1642 | DMEMIT(" %s", decipher_sync_action(&rs->md)); | |
1643 | ||
1644 | /* | |
1645 | * resync_mismatches/mismatch_cnt | |
1646 | * This field shows the number of discrepancies found when | |
1647 | * performing a "check" of the array. | |
1648 | */ | |
1649 | DMEMIT(" %llu", | |
c4a39551 | 1650 | (strcmp(rs->md.last_sync_action, "check")) ? 0 : |
be83651f JB |
1651 | (unsigned long long) |
1652 | atomic64_read(&rs->md.resync_mismatches)); | |
9d09e663 N |
1653 | break; |
1654 | case STATUSTYPE_TABLE: | |
1655 | /* The string you would use to construct this array */ | |
46bed2b5 | 1656 | for (i = 0; i < rs->md.raid_disks; i++) { |
ad51d7f1 | 1657 | if (_test_flag(CTR_FLAG_REBUILD, rs->ctr_flags) && |
13c87583 | 1658 | rs->dev[i].data_dev && |
9d09e663 | 1659 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
13c87583 | 1660 | raid_param_cnt += 2; /* for rebuilds */ |
46bed2b5 JB |
1661 | if (rs->dev[i].data_dev && |
1662 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1663 | raid_param_cnt += 2; | |
1664 | } | |
9d09e663 | 1665 | |
c76d53f4 HM |
1666 | raid_param_cnt += (hweight32(rs->ctr_flags & ~CTR_FLAG_REBUILD) * 2); |
1667 | if (rs->ctr_flags & (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)) | |
9d09e663 N |
1668 | raid_param_cnt--; |
1669 | ||
1670 | DMEMIT("%s %u %u", rs->raid_type->name, | |
1671 | raid_param_cnt, rs->md.chunk_sectors); | |
1672 | ||
ad51d7f1 HM |
1673 | if (_test_flag(CTR_FLAG_SYNC, rs->ctr_flags) && |
1674 | rs->md.recovery_cp == MaxSector) | |
9d09e663 | 1675 | DMEMIT(" sync"); |
ad51d7f1 | 1676 | if (_test_flag(CTR_FLAG_NOSYNC, rs->ctr_flags)) |
9d09e663 N |
1677 | DMEMIT(" nosync"); |
1678 | ||
1679 | for (i = 0; i < rs->md.raid_disks; i++) | |
ad51d7f1 | 1680 | if (_test_flag(CTR_FLAG_REBUILD, rs->ctr_flags) && |
13c87583 | 1681 | rs->dev[i].data_dev && |
9d09e663 N |
1682 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
1683 | DMEMIT(" rebuild %u", i); | |
1684 | ||
ad51d7f1 | 1685 | if (_test_flag(CTR_FLAG_DAEMON_SLEEP, rs->ctr_flags)) |
9d09e663 N |
1686 | DMEMIT(" daemon_sleep %lu", |
1687 | rs->md.bitmap_info.daemon_sleep); | |
1688 | ||
ad51d7f1 | 1689 | if (_test_flag(CTR_FLAG_MIN_RECOVERY_RATE, rs->ctr_flags)) |
9d09e663 N |
1690 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); |
1691 | ||
ad51d7f1 | 1692 | if (_test_flag(CTR_FLAG_MAX_RECOVERY_RATE, rs->ctr_flags)) |
9d09e663 N |
1693 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); |
1694 | ||
46bed2b5 JB |
1695 | for (i = 0; i < rs->md.raid_disks; i++) |
1696 | if (rs->dev[i].data_dev && | |
1697 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1698 | DMEMIT(" write_mostly %u", i); | |
1699 | ||
ad51d7f1 | 1700 | if (_test_flag(CTR_FLAG_MAX_WRITE_BEHIND, rs->ctr_flags)) |
9d09e663 N |
1701 | DMEMIT(" max_write_behind %lu", |
1702 | rs->md.bitmap_info.max_write_behind); | |
1703 | ||
ad51d7f1 | 1704 | if (_test_flag(CTR_FLAG_STRIPE_CACHE, rs->ctr_flags)) { |
d1688a6d | 1705 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1706 | |
1707 | /* convert from kiB to sectors */ | |
1708 | DMEMIT(" stripe_cache %d", | |
1709 | conf ? conf->max_nr_stripes * 2 : 0); | |
1710 | } | |
1711 | ||
ad51d7f1 | 1712 | if (_test_flag(CTR_FLAG_REGION_SIZE, rs->ctr_flags)) |
c1084561 JB |
1713 | DMEMIT(" region_size %lu", |
1714 | rs->md.bitmap_info.chunksize >> 9); | |
1715 | ||
ad51d7f1 | 1716 | if (_test_flag(CTR_FLAG_RAID10_COPIES, rs->ctr_flags)) |
63f33b8d JB |
1717 | DMEMIT(" raid10_copies %u", |
1718 | raid10_md_layout_to_copies(rs->md.layout)); | |
1719 | ||
ad51d7f1 | 1720 | if (_test_flag(CTR_FLAG_RAID10_FORMAT, rs->ctr_flags)) |
fe5d2f4a JB |
1721 | DMEMIT(" raid10_format %s", |
1722 | raid10_md_layout_to_format(rs->md.layout)); | |
63f33b8d | 1723 | |
9d09e663 N |
1724 | DMEMIT(" %d", rs->md.raid_disks); |
1725 | for (i = 0; i < rs->md.raid_disks; i++) { | |
b12d437b JB |
1726 | if (rs->dev[i].meta_dev) |
1727 | DMEMIT(" %s", rs->dev[i].meta_dev->name); | |
1728 | else | |
1729 | DMEMIT(" -"); | |
9d09e663 N |
1730 | |
1731 | if (rs->dev[i].data_dev) | |
1732 | DMEMIT(" %s", rs->dev[i].data_dev->name); | |
1733 | else | |
1734 | DMEMIT(" -"); | |
1735 | } | |
1736 | } | |
9d09e663 N |
1737 | } |
1738 | ||
be83651f JB |
1739 | static int raid_message(struct dm_target *ti, unsigned argc, char **argv) |
1740 | { | |
1741 | struct raid_set *rs = ti->private; | |
1742 | struct mddev *mddev = &rs->md; | |
1743 | ||
1744 | if (!strcasecmp(argv[0], "reshape")) { | |
1745 | DMERR("Reshape not supported."); | |
1746 | return -EINVAL; | |
1747 | } | |
1748 | ||
1749 | if (!mddev->pers || !mddev->pers->sync_request) | |
1750 | return -EINVAL; | |
1751 | ||
1752 | if (!strcasecmp(argv[0], "frozen")) | |
1753 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1754 | else | |
1755 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1756 | ||
1757 | if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { | |
1758 | if (mddev->sync_thread) { | |
1759 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1760 | md_reap_sync_thread(mddev); | |
1761 | } | |
1762 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1763 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
1764 | return -EBUSY; | |
1765 | else if (!strcasecmp(argv[0], "resync")) | |
1766 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1767 | else if (!strcasecmp(argv[0], "recover")) { | |
1768 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1769 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1770 | } else { | |
1771 | if (!strcasecmp(argv[0], "check")) | |
1772 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
1773 | else if (!!strcasecmp(argv[0], "repair")) | |
1774 | return -EINVAL; | |
1775 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1776 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1777 | } | |
1778 | if (mddev->ro == 2) { | |
1779 | /* A write to sync_action is enough to justify | |
1780 | * canceling read-auto mode | |
1781 | */ | |
1782 | mddev->ro = 0; | |
1783 | if (!mddev->suspended) | |
1784 | md_wakeup_thread(mddev->sync_thread); | |
1785 | } | |
1786 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1787 | if (!mddev->suspended) | |
1788 | md_wakeup_thread(mddev->thread); | |
1789 | ||
1790 | return 0; | |
1791 | } | |
1792 | ||
1793 | static int raid_iterate_devices(struct dm_target *ti, | |
1794 | iterate_devices_callout_fn fn, void *data) | |
9d09e663 N |
1795 | { |
1796 | struct raid_set *rs = ti->private; | |
1797 | unsigned i; | |
73c6f239 | 1798 | int r = 0; |
9d09e663 | 1799 | |
73c6f239 | 1800 | for (i = 0; !r && i < rs->md.raid_disks; i++) |
9d09e663 | 1801 | if (rs->dev[i].data_dev) |
73c6f239 | 1802 | r = fn(ti, |
9d09e663 N |
1803 | rs->dev[i].data_dev, |
1804 | 0, /* No offset on data devs */ | |
1805 | rs->md.dev_sectors, | |
1806 | data); | |
1807 | ||
73c6f239 | 1808 | return r; |
9d09e663 N |
1809 | } |
1810 | ||
1811 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
1812 | { | |
1813 | struct raid_set *rs = ti->private; | |
1814 | unsigned chunk_size = rs->md.chunk_sectors << 9; | |
d1688a6d | 1815 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1816 | |
1817 | blk_limits_io_min(limits, chunk_size); | |
1818 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); | |
1819 | } | |
1820 | ||
1821 | static void raid_presuspend(struct dm_target *ti) | |
1822 | { | |
1823 | struct raid_set *rs = ti->private; | |
1824 | ||
1825 | md_stop_writes(&rs->md); | |
1826 | } | |
1827 | ||
1828 | static void raid_postsuspend(struct dm_target *ti) | |
1829 | { | |
1830 | struct raid_set *rs = ti->private; | |
1831 | ||
1832 | mddev_suspend(&rs->md); | |
1833 | } | |
1834 | ||
f381e71b | 1835 | static void attempt_restore_of_faulty_devices(struct raid_set *rs) |
9d09e663 | 1836 | { |
9092c02d JB |
1837 | int i; |
1838 | uint64_t failed_devices, cleared_failed_devices = 0; | |
1839 | unsigned long flags; | |
1840 | struct dm_raid_superblock *sb; | |
9092c02d | 1841 | struct md_rdev *r; |
9d09e663 | 1842 | |
f381e71b JB |
1843 | for (i = 0; i < rs->md.raid_disks; i++) { |
1844 | r = &rs->dev[i].rdev; | |
1845 | if (test_bit(Faulty, &r->flags) && r->sb_page && | |
796a5cf0 MC |
1846 | sync_page_io(r, 0, r->sb_size, r->sb_page, REQ_OP_READ, 0, |
1847 | 1)) { | |
f381e71b JB |
1848 | DMINFO("Faulty %s device #%d has readable super block." |
1849 | " Attempting to revive it.", | |
1850 | rs->raid_type->name, i); | |
a4dc163a JB |
1851 | |
1852 | /* | |
1853 | * Faulty bit may be set, but sometimes the array can | |
1854 | * be suspended before the personalities can respond | |
1855 | * by removing the device from the array (i.e. calling | |
1856 | * 'hot_remove_disk'). If they haven't yet removed | |
1857 | * the failed device, its 'raid_disk' number will be | |
1858 | * '>= 0' - meaning we must call this function | |
1859 | * ourselves. | |
1860 | */ | |
1861 | if ((r->raid_disk >= 0) && | |
1862 | (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0)) | |
1863 | /* Failed to revive this device, try next */ | |
1864 | continue; | |
1865 | ||
f381e71b JB |
1866 | r->raid_disk = i; |
1867 | r->saved_raid_disk = i; | |
1868 | flags = r->flags; | |
1869 | clear_bit(Faulty, &r->flags); | |
1870 | clear_bit(WriteErrorSeen, &r->flags); | |
1871 | clear_bit(In_sync, &r->flags); | |
1872 | if (r->mddev->pers->hot_add_disk(r->mddev, r)) { | |
1873 | r->raid_disk = -1; | |
1874 | r->saved_raid_disk = -1; | |
1875 | r->flags = flags; | |
1876 | } else { | |
1877 | r->recovery_offset = 0; | |
1878 | cleared_failed_devices |= 1 << i; | |
1879 | } | |
1880 | } | |
1881 | } | |
1882 | if (cleared_failed_devices) { | |
1883 | rdev_for_each(r, &rs->md) { | |
1884 | sb = page_address(r->sb_page); | |
1885 | failed_devices = le64_to_cpu(sb->failed_devices); | |
1886 | failed_devices &= ~cleared_failed_devices; | |
1887 | sb->failed_devices = cpu_to_le64(failed_devices); | |
1888 | } | |
1889 | } | |
1890 | } | |
1891 | ||
1892 | static void raid_resume(struct dm_target *ti) | |
1893 | { | |
1894 | struct raid_set *rs = ti->private; | |
1895 | ||
676fa5ad | 1896 | if (!rt_is_raid0(rs->raid_type)) { |
0cf45031 HM |
1897 | set_bit(MD_CHANGE_DEVS, &rs->md.flags); |
1898 | ||
1899 | if (!rs->bitmap_loaded) { | |
1900 | bitmap_load(&rs->md); | |
1901 | rs->bitmap_loaded = 1; | |
1902 | } else { | |
1903 | /* | |
1904 | * A secondary resume while the device is active. | |
1905 | * Take this opportunity to check whether any failed | |
1906 | * devices are reachable again. | |
1907 | */ | |
1908 | attempt_restore_of_faulty_devices(rs); | |
1909 | } | |
1910 | ||
1911 | clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); | |
47525e59 | 1912 | } |
34f8ac6d | 1913 | |
9d09e663 N |
1914 | mddev_resume(&rs->md); |
1915 | } | |
1916 | ||
1917 | static struct target_type raid_target = { | |
1918 | .name = "raid", | |
702108d1 | 1919 | .version = {1, 8, 1}, |
9d09e663 N |
1920 | .module = THIS_MODULE, |
1921 | .ctr = raid_ctr, | |
1922 | .dtr = raid_dtr, | |
1923 | .map = raid_map, | |
1924 | .status = raid_status, | |
be83651f | 1925 | .message = raid_message, |
9d09e663 N |
1926 | .iterate_devices = raid_iterate_devices, |
1927 | .io_hints = raid_io_hints, | |
1928 | .presuspend = raid_presuspend, | |
1929 | .postsuspend = raid_postsuspend, | |
1930 | .resume = raid_resume, | |
1931 | }; | |
1932 | ||
1933 | static int __init dm_raid_init(void) | |
1934 | { | |
fe5d2f4a JB |
1935 | DMINFO("Loading target version %u.%u.%u", |
1936 | raid_target.version[0], | |
1937 | raid_target.version[1], | |
1938 | raid_target.version[2]); | |
9d09e663 N |
1939 | return dm_register_target(&raid_target); |
1940 | } | |
1941 | ||
1942 | static void __exit dm_raid_exit(void) | |
1943 | { | |
1944 | dm_unregister_target(&raid_target); | |
1945 | } | |
1946 | ||
1947 | module_init(dm_raid_init); | |
1948 | module_exit(dm_raid_exit); | |
1949 | ||
48cf06bc HM |
1950 | module_param(devices_handle_discard_safely, bool, 0644); |
1951 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
1952 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
1953 | ||
9d09e663 | 1954 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); |
63f33b8d JB |
1955 | MODULE_ALIAS("dm-raid1"); |
1956 | MODULE_ALIAS("dm-raid10"); | |
9d09e663 N |
1957 | MODULE_ALIAS("dm-raid4"); |
1958 | MODULE_ALIAS("dm-raid5"); | |
1959 | MODULE_ALIAS("dm-raid6"); | |
1960 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
1961 | MODULE_LICENSE("GPL"); |